Input a infix: 1+1
Exception in thread "main" java.lang.NumberFormatException: For input string: "1
+1"
at java.lang.NumberFormatException.forInputString(NumberFormatException.
java:48)
at java.lang.Integer.parseInt(Integer.java:456)
at java.lang.Integer.parseInt(Integer.java:497)
at Mlab2.toPostfix(Mlab2.java:23)
at Mlab2.main(Mlab2.java:125)